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Strip Whitespace From String

Whitespace, meaning tabs and spaces.

Vanilla JavaScript (Trim Leading and Trailing)

var str = " a b    c d e   f g   ";
var newStr = str.trim();
// "a b    c d e   f g"

That method is ES 5, so just in case you could polyfill it (IE 8 and down):

if (!String.prototype.trim) {
  String.prototype.trim = function () {
    return this.replace(/^\s+|\s+$/g, '');
  };
}

jQuery (Trim Leading and Trailing)

If you're using jQuery anyway:

var str = " a b    c d e f g ";
var newStr = $.trim(str);
// "a b    c d e f g"

Vanilla JavaScript RegEx (Trim Leading and Trailing)

var str = "   a b    c d e f g ";
var newStr = str.replace(/(^\s+|\s+$)/g,'');
// "a b    c d e f g"

Vanilla JavaScript RegEx (Trim ALL Whitespace)

var str = " a b    c d e   f g   ";
var newStr = str.replace(/\s+/g, '');
// "abcdefg"

Demos

See the Pen Remove Whitespace from Strings by Chris Coyier (@chriscoyier) on CodePen.


Note that none of this works with other types of whitespace, for instance   (thin space) or   (non-breaking space).


You can also trim strings from the front or back.

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